The third floor of the tower is much colder than the second floor and even gives me goose bumps.

The third floor is empty and there is nothing on it, which makes me feel a little strange, so I simply walk towards the fourth floor.

But as I approached the stairway, I suddenly felt that there seemed to be an invisible wall in front of me. And the wall is as soft as marshmallow. First it wraps me up, and then it bounces me back gently.

"Hmm?"

I walked doubtfully and quickly two steps forward, only to be bounced back more forcefully. At this time, I knew there was a...